Strength and Young's modulus change in concrete due to long-term drying and heating up to 90°C

Maruyama, Isao; Sasano, Hiroshi; Nishioka, Yukiko; Igarashi, Go

doi:10.1016/j.cemconres.2014.07.016

Cited by 112 publications

(71 citation statements)

References 25 publications

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“…In the present study, the impact of gamma rays on hardened cement paste and concrete is assumed to be the same as the impact of heating and drying on these materials, which has been already modeled in previous studies (Maruyama et al 2014a(Maruyama et al , 2014b. The existing data (Vodák et al 2005) also support this assumption.…”

Section: 2supporting

confidence: 61%

“…Due to its size, the heat of hydration accumulated up to ~60 °C. In case of some aggregates, concrete strength development was stagnated or deteriorated because of increase in number of large pores by formation of densified outer C-S-H due to elevated temperature (Sugiyama and Masuda 1999;Gallucci et al 2013) and the difference between the volume changes in the aggregate and matrix and resultant damage accumulation around aggregates (Son and Hosoda 2010;Maruyama et al 2014b). However, in this calculation, silicate content was high and the thermal expansion of the aggregate was 10 × 10 -6 /K.…”

Section: Resultsmentioning

confidence: 53%

“…As the concrete properties are dominated by cracks due to mismatched volume change between the aggregate and matrix (paste or mortar) and due to the colloidal nature of hardened cement paste (Maruyama et al 2014b), concrete expansion strain must be a key factor that reflects the damage and cracks of concrete caused by aggregate expansion (Dubrovskii et al 1967;. There exist models regarding the concrete volume change, especially under drying, based on the information of mixture proportion and properties and volume change of the components.…”

Section: Impact Of Neutronsmentioning

confidence: 99%

See 2 more Smart Citations

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Maruyama

Haba²,

Sato

et al. 2016

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For performance evaluation of existing reinforced concrete members under irradiation conditions, a numerical code called "DEVICE" (Damage EValuation for Irradiated ConcretE), which takes into account the heat, moisture, and radiation transport coupled with cement hydration, is proposed. This code is composed of the established computational cement-based material (CCBM) model and the one-dimensional deterministic transport Sn code "ANISN". In the proposed model, temperature-dependent irradiation-induced expansion of aggregate minerals and resultant strength deterioration of concrete are introduced. Currently, the knowledge and modeling of irradiation-induced expansion of aggregate mineral is limited only for α-quartz. DEVICE was used for evaluating the strength distribution of the decommissioned plant Japan Power Demonstration Reactor (JPDR). Compressive strength distribution in a concrete biological shielding (CBS) wall of the JPDR was obtained by core sampling, and the compressive loading test results were compared with the calculation results. This comparison proved the practicality potential of DEVICE to predict the concrete strength distribution in a CBS. In addition, concrete strength change and its distribution in a CBS of an anonymous two-loop pressurized water reactor was simulated by DEVICE. The contributing factors for the change in the distribution of concrete strength at the inner surface of the CBS are discussed. Furthermore, the ways of integrity evaluation other than the existing allowable fast neutron fluence method are proposed and discussed as follows: 1) mineral composition-based allowable fast neutron fluence; 2) strength prediction at the inner surface based on the expansion of mineral composition of aggregates and the lower limit curve of the ratio of compressive strength of the specimen after irradiation (Fc) to that of the reference specimen (Fco) as a function of concrete expansion; and 3) direct numerical calculation for seismic performance by considering irradiation-induced volume expansion and degradation of concrete.

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Section: 2supporting

confidence: 61%

Section: Resultsmentioning

confidence: 53%

Section: Impact Of Neutronsmentioning

confidence: 99%

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A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Maruyama

Haba²,

Sato

et al. 2016

ACT

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“…In other words, the moisture content of cement paste for HSC-2 affects the compressive strength of concrete. Additionally, the change in the strength of concrete is due to the behavior of the cement paste matrix, the restraint of coarse aggregate and the damage accumulation caused by differences in volume changes between the aggregate and mortar (Maruyama et al 2014;Lin et al 2015). Although the incorporation of the pre-wetted LWA with a porous surface enable ITZs to produce a dense microstructure (Bentz 2009), the effect of LWAs on the strength of matured concrete is variable and depends on the LWA type and content, the mineral admixture and normal aggregate content (Elsharief 2005;Zhutovsky and Kovler 2012).…”

Section: Testing Proceduresmentioning

confidence: 99%

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Wang

Bao

Cheng

2017

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This paper presents the results of an experimental study conducted to evaluate the effect of curing conditions on the properties of normal and high strength concrete (NSC and HSC) with and without pre-wetted lightweight aggregates (LWAs). Cylinder specimens were drilled out from square concrete slabs subjected to four curing regimes (i.e. standard, water, natural and sealed curing) respectively, and then tested to obtain the compressive strength after 60 days. Three discs cut along the height direction of cylinder specimens (top, middle and bottom) were used to orderly measure the ultrasonic pulse velocity (UPV), open porosity, water absorption and splitting tensile strength. Afterwards, the comprehensive evaluation index, i.e. relative curing efficiency (RCE), was proposed based on the testing results above to quantitatively assess the effect of curing conditions on the physical properties of concrete. The experimental results indicated that curing conditions significantly influence the strengths and durability-related properties of NSC and HSC. The linear correlation can be obtained between sorptivity and open porosity of concrete under various curing conditions. Furthermore, in terms of the RCE analysis, the durability-related properties are more sensitive to the curing conditions than strengths for NSC and HSC.

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“…The volume change of a concrete component has a significant role on the strength of concrete (Lin et al 2015;Maruyama et al 2014b). The Young's modulus and Poisson's ratio of hardened cement paste under sealed conditions are first addressed.…”

Section: Modulus Of Elasticity Shrinkage and Thermal Expansion Coefmentioning

confidence: 99%

Numerical Approach towards Aging Management of Concrete Structures: Material Strength Evaluation in a Massive Concrete Structure under One-Sided Heating

Maruyama

Igarashi

2015

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For the purpose of performance evaluation of an existing reinforced concrete member, a chemo-thermo-hygro model to predict the spatial and temporal changes of physical properties of concrete in the member, named the "Computational Cement-Based Material Model (CCBM)", was proposed. This proposed simulation model includes models of rate of hydration of cement minerals, phase composition, and resultant properties of cement paste (i.e., compressive strength, Young's modulus, Poisson's ratio, thermal expansion coefficient, autogenous shrinkage, drying shrinkage, heat capacity, heat transfer coefficient, water vapor sorption isotherms, and water transfer coefficient). Furthermore, the model for compressive strength of concrete considered the variation in cement paste strength due to its colloidal features as well as micro-defects produced around aggregate due to differences in volume between aggregates and mortar upon heating and drying. The concrete properties of spatial distribution and temporal changes were evaluated by coupling these models with heat and water transport. Validation of these models was achieved by using existing experimental data. Using this CCBM, a thick concrete wall made with moderate Portland cement with a water-to-cement ratio of 0.55 under one-sided heating was simulated and potential problems that can arise during an integrity evaluation were discussed. If the required compressive strength, which was assessed within 91 days of placement, remains unchanged, an additional hydration process can build an adequate strength margin to overcome the risk of strength reduction due to heat and drying. However, in the case that the required strength is increased due to a re-evaluated risk, such as the magnitude of an earthquake, performance evaluation is not trivial as the core sample taken from the side where the execution of sampling is possible could exhibit a greater strength than the average strength of the target concrete member. Therefore, numerical evaluation might aid in this kind of situation.

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Strength and Young's modulus change in concrete due to long-term drying and heating up to 90°C

Cited by 112 publications

References 25 publications

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

Numerical Approach towards Aging Management of Concrete Structures: Material Strength Evaluation in a Massive Concrete Structure under One-Sided Heating

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